462 



Euphotide 132 



Eurite 291 



Eutectic compounds 895 



F 



FARSKY, chrome-diopside 89 



Felspar, alteration of 148 



determination of 142 



decomposition of 413 



dynamic metamorphosis 152,175 



inclusions in 28 



ofpicrites 93 



of serpentine 119 



of basic rocks 137 



of intermediate rocks ... 259 



of acid rocks ... 296 



of mica-traps 352 



of contact-rocks . 376, 379, 384 



Felsifce ... 291, 310 



passage into micaceous 



schist 341 



Felsite-porphyry 291 



Felsitic texture 60 



Felsophyre 



Felsospherites 308 



Felspar-mosaic 299 



Ferro-magnesian minerals, decom- 

 position of 414 



Flaser-gabbro 177 



Flaser-structure 245 



Fluid-inclusions 22, 24, 26, 27 



Fluorine-compounds, effect of on 



rocks 415 



Fluorite ... 305 



Fibrolite 383 



FOEESTNER, pantellarite 371 



FORCHAMMER, geyserite 411 



Forellenstein 133, 186 



FOUQUE, San torin lavas 53 



FOUQU AND LEVY, artificial produc- 

 tion of igneous rocks 42, 403 

 - different phases 



of consolidation 54 



Foyaite 359 



Fragmental rocks (basic) 214 



Fragruental igneous rocks, origin of 408 

 FRENZEL, relation between struc- 

 ture and composition of rocks 

 and their geological age ... 23, 65 



Fulgurite 13 



G 



Gabbro 132, 171 



foliation in 174 



inclusions in minerals of 28 



Garnet 342, 383 



Garnet-hornfels 



Gas-inclusions 



GEIKIE, A., basic rocks 

 David's ... 

 dolerite 



of 



PAGE 



375, 376 



... 18 

 St. 



... 222 

 192 



felsites of St. David's 335 



granite of St. David's 818 



picrite 81, 94 



porphyrite 285 



Geyser-water, composition of ... 411 



Gieseckite-porphyry 360 



Glass, characters of 12 



- devitrification of 13, 293, 342, 347 



Glass-inclusions 19 



Glassy base, composition of 42 



Globospherites 308 



Globulites 14, 194 



Glomero-porphyritic structure 186, 230 



Gneiss 295 



Gneissose granite 325, 831 



Granites, British 310 



classification of 290 



dynamic metamorphosis 



of 317 



effect on dolerite and dia- 



base 236 



passage into gneiss and 



schist ' ... 325 



-veins 236 



Granitic texture 57 



Granitite 291 



Granophyre 292,319,323,342 



Granospherites 308 



Granular texture 53,55 



Granulitic texture 58 



Granulation of felspar 175 



Granulite 281,295 



Greenstone 136,215,221,228 



Greisen 294, 315 



Ground-mass, of acid rocks 806 



- varieties of 59 



GUMBEL, epidiorite 135 



keratophyre 369 



lamprophyre 355 



leucophyre 135 



leucoxene 167 



palseopicrite 80 



peridotites 79 



proterobase 135 



GUTHRIE, cryohydrates and eutectic 



compounds ... 393, 395 



GYLLING, sagenite 167 



H 



HAGUE AND IDDINGS, development of 



crystallization in igneous rocks 23 



glassy base of andesites ... 43 



nevadite 75 



